Aircraft wing-pylon connection

A method of forming an aircraft assembly, the method comprising:

• providing an aircraft wing component including a triangular arrangement consisting of with three fastening locations arranged in a triangle and in a plane, wherein the aircraft wing component includes having three first spherical surfaces each at a respective one of the fastening locations and the three first spherical surfaces are each configured to receive a respective tension fastener configured for use to attach an engine mounting pylon to the wing component;
• providing the engine mounting pylon with three second spherical surfaces each having an opposite curvature to a curvature of the first spherical surfaces, wherein each of the three second spherical surfaces are at a respect one of the three fastening locations;
• arranging the three second spherical surfaces in contact with the three first spherical surfaces;
• arranging the engine mounting pylon on the aircraft wing component;
• and
• installing the tension fasteners at the three fastener locations,
• wherein each of the tension fasteners extends through different ones of the three fastener locations, the three first spherical surfaces and the three second spherical surfaces,
• wherein each of the tension fasteners is secured to the engine mounting pylon and to the aircraft wing component, and
• wherein the triangular arrangement provides are the three fastening locations on the wing component for fastening the wing component to the engine mounting pylon.